The microstructure of GH4163 alloy at different solid solution temperatures， the changing pattern of tensile properties at room and high temperature， are investigated by adjusting the solution temperature. The microstructure of the original state sample is deformed tissue， with discontinuous grain boundaries and biased polymer band distribution. The grain boundaries are clear ， the grain has incomplete recrystallization， and the band polarization of carbide strip is significantly improved when the solid solution temperature is 1 000 ℃. The grains grow slowly when the solution temperature is 1 050 ℃. The carbides are significantly reduced， and the grains begin to grow rapidly when the solution temperature is 1 080 ℃. The relationship between grain size and yield strength of GH4163 alloy at room temperature satisfies Hall-Petch， which is

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. The tensile strength of the alloy at high temperature changes little with the solution temperature increasing. Both room and high temperature plasticity increases first and then decreases. The alloy exhibits the most excellent elongation at the solid solution temperature of 1 080 ℃.